Make uk_transport sensor timezone/DST aware

[tsvi]

Breaking Change:

Description:

When getting now, we should use dt_util.now so it is timezone aware

Related issue (if applicable): fixes #26237

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

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[MartinHjelmare]

Please rebase on latest dev branch to let the build pass.

[tsvi]

@MartinHjelmare ready for merge